If all of AGW science was done by Assistant Professors, you'd have a point.
If already tenured professors didn't have a massive say in what was published by those tenure seekers, you might have a point.
The whole "they lose their jobs" argument falls completely apart with even a trivial examination of the evidence of understanding of how science operates. It is laughable. The only people who believe it are those who are looking for excuses to dismiss the science in favor of their a-priori positions.